Scotsman MAR 76, MAR 106, MAR 56, MAR 206, MAR 306 Service Manual

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Page 1

Scotsman Ice Srl Via Lainate, 31 - 20010 Pogliano M.se - Milano - Italy Tel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500 Direct Line to Service & Parts: Phone +39-02-93960350 - Fax +39-02-93540449 Website: www.scotsman-ice.it E-Mail: scotsman.europe@scotsman.it

ISO 9001 - Cert. n. 0080

SERVICE MANUAL

MAR 56 MAR 76 MAR 106 MAR 126 MAR 206

MAR 306

Scale ice machines

MS 1000.66 - REV. 06/2018

Page 2

FOREWORD

The "MAR" ice makers make flake ice of "scale" type which is flat, hard dry and sub-cooled, giving to it an exceptional staying power for multiple chilling operations.

The design simplicity accounts for the confidence in MAR scale ice machines. Their ice making system has only one sealed moving part, resulting in a minimum of maintenance operations for continuous reliable machine service.

Ice is discharges through a large opening on the back of unit cabinet, when mounted on top of the refrigerated room, ice is gravity fed to storage area.

Rugged, solid, heavy duty, the stainless steel MAR cabinet has removable panels that facilitate the accessibility to mechanical and electrical parts. A console panel with lights monitoring water flow pressure, and temperature operating refrigerant pressure and motors overloading foreworn the system malfunction before becoming major trouble.

We suggest you to take time now to read this manual which contains a lot of valuable informations on the MAR ice making system.

If you have any further queries regarding the care or operation of the machine, please contact:

NOTE: Whenever writing please state model no. and serial no. of the machine

ICE SYSTEMS

SCOTSMAN - EUROPE - FRIMONT SPA Via Puccini, 22 - 20010 Bettolino di Pogliano (Milano) Italy Tel. +39-02-93960.1 (Aut. Sel.)- Telefax +39-02-93550500 Direct Line to Service & Parts: Phone +39-02-93960350 - Fax +39-02-93540449 Website: www.scotsman-ice.com E-Mail: scotsman.europe@frimont.it

Page 3

TABLE OF

CONTENTS

Foreword page 2 Table of contents 3 Specifications - MAR 56 - 76 - 106 - 126 4-5-6 Specifications - MAR 206 - 306 7-8 Remote cond. 9

Section I GENERAL INFORMATIONS & INSTALLATIONS

Description 10 Unpacking & Inspection 10 Location & Levelling 11 Electrical connections 12 Water supply & Drain connections 12 Remote air cooled condenser installation 13 Ice level control 14 Ice chute 15 Final check list 15 Unit installation practice 15-16

Section II OPERATING INSTRUCTIONS

Start-up 17 Water & Refrigerant circuit 18-19

Section III PRINCIPLES OF OPERAZION - HOW IT WORKS

Ice maker 20 Electrical / Refrigeration 21-22-23 Refrigerant charge 24 Mechanicals 24

Section IV ADJUSTMENT & REMOVAL & REPLACEMENT

PROCEDURES

Water regulator assy 25 Automatic expansion valve 25 V Belt change on pulley 25 Compressor replacement 25 Water cooled condens. replacement 26 Water regulator replacement 26 Drier replacement 26 Drive motor replacement 27 Gear Box replacement 28 Fiber key replacement 28

Section V MAINTENANCE & CLEANING INSTRUCTIONS

General 29 Ice maker 29 Cleaning instruction 29-30-31-32

Section VI SERVICE DIAGNOSIS

Ice making - Refrigerant system 33-34

Section VII WIRING DIAGRAMS 35

MAR 56-76-106-126 - Wiring diagram 36÷38 MAR 206-306 - Wiring diagram Fig. 1 e 2 39÷42

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SPECIFICATIONS

NOTE. Daily ice capacity is directly related to condenser air water inlet temperature, water

temperature to make ice - and age of machine. To keep your SCOTSMAN MAR performing at is maximum capacity, it is necessary to perform periodic maintenance as outlined on page 29 of this manual.

MAR 56

AIR & WATER COOLED MODELS

THICK SCALE ICE THIN SCALE ICE

ice making capacity

500

450

400

350

300

250

200

Kg./24 h

°C

32 27

°C

AIR COOLED MODELS

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

WATER COOLED MODELS

10 5

10 21

500

450

400

350

300

250

200

Kg./24 h

°C

32 27

°C

DE 10 A' 38

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

MAR 76

AIR & WATER COOLED MODELS

ice making capacity

THICK SCALE ICE THIN SCALE ICE

AIR COOLED MODELS

540

500

460

420

380

340

300

Kg./24 h

°C

32 27

°C

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

Page 5

SPECIFICATIONS

NOTE. Daily ice capacity is directly related to condenser air water inlet temperature, water

temperature to make ice - and age of machine. To keep your SCOTSMAN MAR performing at is maximum capacity, it is necessary to perform periodic maintenance as outlined on page 29 of this manual.

MAR 106

AIR & WATER COOLED MODELS

THICK SCALE ICE THIN SCALE ICE

ice making capacity

MAR 126

AIR & WATER COOLED MODELS

ice making capacity

THICK SCALE ICE THIN SCALE ICE

AIR COOLED MODELS

750

700

650

600

550

500

450

Kg./24 h

°C

32 27

°C

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

WATER COOLED MODELS

800

750

700

650

600

550

500

Kg./24 h

°C

32 27

°C

DE 10 A' 38

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

AIR COOLED MODELS

1000

950

900

850

750

650

600

Kg./24 h

°C

32 27

°C

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

Page 6

MAR 56-76-106-126 - SPECIFICATIONS

BASIC ELECTRICALS: 400/50/3N * at 21 °C amb. / 15 °C water temp.

Water req. (l/h) Total Amps.

MODELS Finish

* Cond. Prod. 400 V kg. lbs.

MAR 56 AS Air 2 16 2.2 5 x 1.5 2.7 Stainless 194 427

MAR 56 WS Water 2 225 16 2.2 5 x 1.5 2.7 Steel 174 383

MAR 76 AS Air 2.5 21 2.5 5 x 1.5 2.7 Stainless 204 450

MAR 76 WS Water 2.5 300 21 2.5 5 x 1.5 2.7 Steel 201 442 MAR 106 AS Air 4 30 3.5 5 x 1.5 5 Stainless 221 487 MAR 106 WS Water 4 480 30 3.5 5 x 1.5 5 Steel 217 417 MAR 126 AS Air 4.5 41 4.5 5 x 1.5 6.5 Stainless 226 497

MAR 126 WS Water 4.5 41 4.5 5 x 1.5 6.5 Steel 222 488

Cond. Compr. Power Minimum

Unit (HP) (KW) wire size (mm)

Shipping weight

Page 7

SPECIFICATIONS

NOTE. Daily ice capacity is directly related to condenser air water inlet temperature, water

temperature to make ice - and age of machine. To keep your SCOTSMAN MAR performing at is maximum capacity, it is necessary to perform periodic maintenance as outlined on page 29 of this manual.

MAR 206

AIR & WATER COOLED MODELS

ice making capacity

THICK SCALE ICE THIN SCALE ICE

1700

1600

1500

1400

1300

1200

1100

Kg./24 h

°C

32 27

°C

32 38

AIR COOLED MACHINES

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

WATER COOLED MACHINES

10 5

10 21

1900

1800

1700

1600

1500

1400

1300

Kg./24 h

°C

32 27

°C

DE 10 A' 38

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

MAR 306

AIR & WATER COOLED MODELS

ice making capacity

2600

2400

2200

2000

1800

1600

1400

Kg./24 h

°C

32 27

°C

AIR COOLED MACHINES

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

32 38

WATER COOLED MACHINES

10 5

10 21

2800

2600

2400

2200

2000

1800

1600

Kg./24 h

°C

32 27

°C

DE 10 A' 38

WA TER TEMPERATURE

AMBIENT TEMPERATURE

ICE PRODUCED PER 24 HRS.

10 5

10 21

THICK SCALE ICE THIN SCALE ICE

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MAR 206-306 - SPECIFICATIONS

BASIC ELECTRICALS: 400/50/3N * at 21 °C amb. / 15 °C water temp.

Water req. (l/h) Total Amps.

MODELS Finish

* Cond. Prod. 400 V kg. lbs.

MAR 206 AS Air 5 69 7 5 x 2.5 17 Stainless 374 824 MAR 206 WS Water 5 1200 72 7 5 x 2.5 10 Steel 369 813 MAR 306 AS Air 10 88 10 5 x 4 20 Stainless 383 844 MAR 306 WS Water 10 1600 94 10 5 x 4 20 Steel 413 910

Cond. Compr. Power Minimum

Unit (HP) (KW) wire size (mm)

Shipping weight

Page 8

Page 9

CONDENSER CAPACITY FAN MOTOR AIR FLOW

20 KW - 17200 Kcal/h 230/50/1 V - 0,8 A 4320 m3/h

MAR 306 REMOTE CONDENSER

TECHNICAL SPECIFICATIONS

Page 10

SECTION I

GENERAL INFORMATION & INSTALLATION

1. DESCRIPTION

An attractive compact cabinet of stainless steel with control panel lights on the front. All panels are removable to allow easy access to electrical and mechanical components for cleaning and maintenance.

Sealed Refrigeration System

To provide quite efficient operation of the ice maker, the compressor is mounted on rubber cushions. The water cooled models have a tube within tube condenser with water regulation valve for correct condensing water flow. The air cooled models, except the MAR 306 have a built in condenser in copper and aluminium with the fan motor controlled by pressure control. The evaporator drum is powered by a separate drive motor connected by a V-belt and pulley system to a double gear box. The refrigerant used is R 404a controlled by automatic expansion valve.

Storage Bin or Ice Room

Since the MAR Scale is a continuous flow type ice maker and does not have its own attached storage bin, it is necessary to use an auxiliary bin or a pre-fabricated ice room for appropriate ice storage.

Ice storage situations are of two kinds: a) Short term storage b) Extended terms storage

Being, as stated, scale ice made by MAR machines flat, dry and subcooled, therefore with the tendency to stick toghether, particular attention is required for proper ice storage conditions for better ice handling. An insulated ice storage bin or rooms is always required, then according to ice end use application, this can be refrigerated on non-refrigerated. Also a weight volume ratio of 2,1 cu. mt. per ton, must be taken into consideration for correct ice storage.

a) Non-refrigerated room for short term

storage.

The scale ice is produced continuously for 24 hours per day, whereas the use period is generally for no longer than 8 hours per day.

Therefore storage facilities should be provided to accomodate a minimum of 16 hours of production, this means that every scale ice machine must be installed with a properly insulated storage room which should have a minimum capacity of 2/3 the daily ice production.

With a well insulated room and duly subcooled scale ice, the limited losses of heat throught the walls of a properly designed room with adequate arrangements, are largely offset,

and excess melting will not occur. In most situations where whole quantity of ice produced is being used on a daily basis, it is not necessary to provide cooling for the ice storage room.

b) Refrigerated room for extended storage

and long distance conveying.

When scale ice is to be transported at a considerable distance, such as aboard fishing vessels, or in locations with normal ambient temperatures conditions, or when used in industrial plants where demand is intermittent, its subcooling power must be absolutely preserved in the storage bin by a proper cooling system keeping air temperature at a pre-established and constant value. The ideal ice storage room is the type with mechanically refrigerated jacket space surrounding the ice bin. Good practice calls for an ice storage capacity of about two times the daily ice machines production with an inside temperature of -6°C minimum (20°F).

2. UNPACKING AND INSPECTION

1. Call your authorized SCOTSMAN Distributor od Dealer for proper installation.

2. Visually inspect the exterior of the shipping container and skid and any severe damage noted should be reported to the delivering carrier; and a concealed damage claim filled subject to internal inspection, with carrier representative present.

3. Remove the packing and remove the shipping bolts and the shipping base or skid.

4. When necessary, install the leg levellers in the cabinet base sockets; then, raise the cabinet to the upright position.

5. Remove screws and shipping tapes and all doors and service panels from the cabinet and inspect for any concealed damage.

Notify carrier of any concealed damage claims

as stated in step 2 above.

6. Remove all internal support packing, tape and wires in machinery compartment.

7. Check that refrigerant lines do not rub or touch lines or surfaces and that fan blades, if any, moves freely.

8. Check that compressor is snug on all mounting pads.

9. Use clean damp cloth or disposable paper wiper to wipe clean the exterior surface of the cabinet.

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CONDENSING AIR FLOW SCHEMATIC

2. Erection - For elevations in excess of four

feet or in close quarters, chain falls of fork lift truck should be used. For location under four feet, the use of skid boards and rollers is practical.

3. Machine Site - When selecting the permanent

location of air cooled machines, consideration must be given to volume size of the room and to ventilation facilities for easy heat removal around the machine. In doing this it worths to take on account that:

– MAR 56 AS - has a condenser heat rejection

of 3000 Kcal/hr and fan motor draws air for 1200 m3/h.

– MAR 76 AS - has a condenser heat rejection

of 4900 Kcal/hr and fan motor draws air for 1200 m3/h.

– MAR 106 AS - has a condenser heat rejection

of 7500 Kcal/hr and the two fan motors draw air for 1200 m3/h each.

– MAR 126 AS - has a condenser heat rejection

of 9750 Kcal/hr and the two fan motors draw air for 1200 m3/h each.

– MAR 206 AS - has a condenser heat rejection

of 11000 Kcal/hr and the two fan motors draw air for 2000 m3/h each.

– MAR 306 AS - has a condenser heat rejection

of 17200 Kcal/hr and the two fan motor draw air for 4320 m3/h in total.

4. Position the MAR in the selected permanent

location level the cabinet on both the left-to-right and front-to-rear directions. The levelling legs can be adjusted with an opened wrench. (See unit layout and dimensions at page 6 and 8).

10. See DATAPLATE on the cabinet base and check that the location source voltage corresponds with the voltage specified on the dataplate.

CAUTION - Unproper voltage supplied to the icemaker will void your parts replacement program.

11. Remove the Manufacturer's registration Card from its envelope and fill in all spaces including: Model Number and serial Number taken from the aluminium plate located on the front of the Chassis base, with Front Panel removed. Forward the completed, self addressed, registration card to the Scotsman Europe Frimont Factory.

3. LOCATION AND LEVELLING

WARNING - The MAR Flakers are NOT designed for outdoors installation where air temperature are below 5°C (40°F) or above 40°C (100°F) and the water temperature is below 5°C (40°F) or above 35°C (95°F). Extended periods of operation at temperatures exceeding these limitations will constitute misuse, under the terms of the SCOTSMAN Manufacturer's limited warranty coverage.

1. Stands - A special stands should be built if the machine is located beside the bin. Care should be exercised in making the stand strong enough to support the weight. In designing the stand plan for the servicing of the machine from front, top and sides. It is also possible to locate the machine on top of the bin. Care should be used in selecting a bin that has been specially reinforced. Standard bins are usually not sufficiently reinforced for this purpose. An unsteady platform will cause excessive vibration. Specially built bins can provide proper support and allow for a servicing platform.

WARNING - Air Cooled version of MAR 76

, MAR 106, MAR 126 and MAR 206 have the condensing air exhaust throughout the lower rear area (ice spout side) therefore it is necessary to avoid to position the ice maker with the rear side against any sort of wall that will prevent proper warm air dissipation.They must

have on their rear

side an air gap of 200 mm.

MAR 56 has the air cooled condenser on the right side while MAR 306 has a se-parate remote air cooled condenser. (See instructions for remote condenser at 6).

MAR 76-106-126 MAR 206

MAR 56

MAR 76-106-126

MAR 206

MAR 56

SIDE

MAR 106 MAR 206 -

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4. ELECTRICAL CONNECTIONS

The machine has been wired ready for electric connections. See nameplate for current requirements to determine wire size to be used for electrical hook-up. The MAR flaker requires a solid earth ground wire. See wiring diagram. Be certain the unit is connected to its own electrical circuit and individually fused. The maximum allowable voltage variation, should not exceed ten percent of the nameplate rating, even under starting conditions. Low voltages can cause erratic operation and may be responsible for serious damage to the overload switch and motor windings. All external wiring should conform to the National, State and local electrical permit and services of a licensed electrician will be required.

WARNING - The compressor is equipped with a crankcase heater which has to be energized even when the ice maker is switched-off. So, make sure to connect the unit with the compressor crankcase heater constantly energized. After long inoperative periods remember to give current to the heater 4 hours before the ice-maker start-up.

Fuse protection of the unit should be made as follows: MAR 56-76-106-126-206 - 3x16 Amps/400V MAR 306 WS - 3x24 Amps/400V MAR 306 ASR - 3x32 Amps/400V

WARNING - Drum drive motor is threephases type. At unit start up, correct wiring is assured by 3 phases monitoring relay at power in. In addition proper drum rotation speed is monitored by a Hall Effect sensor. In case the drum is not rotating at all or it rotates too slow (less then 1/4 turn every 30 seconds) a special Electronic Control trips the unit OFF so to avoid that compressor can operate with the drum OFF (in case of fiber keys

, drive motor or gear reducer breakage). In case of any field drive motor replacement, care must be taken to its wiring, checking the correct evaporator drum rotation that MUST be toward ice blade. In case of wrong evaporator drum rotation, turn the unit OFF and exchange two phases connection at drive motor control box.

WATER SUPPLY AND DRAIN CONNECTIONS

Separate water supplies are recommended. A.Evaporator or ice making supply water should

be run through a hand shut-off valve before entering unit. Evaporator supply water connection has a 3/4" male pipe fitting. This line also has factory installed water strainer internally mounted. Incoming water goes through the float reservoir and then to the drum reservoir. Connect to a good cold water supply with minimum 1/2 O.D. line. A check valve on this line will be required in some cases depending on local plumbing codes. The recommended minimum water pressure

is 1 bar (14 Psi). Do not operate this unit with fresh water supply below 1 bar (14 Psi). Maximum water pressure 5 bar (70 Psi).

B.The condenser water supply line connects to

the following fitting sizes: MAR 56 - 76

3/4" gas male MAR 106 - 126 12 mm O.D. fitting MAR 206 20 mm 0.D. fitting MAR 306 25 mm

Water supply line size must be adequate to water flow which, at 15°C temperature water, is:

225 lt/hr for MAR 56 300 lt/hr for MAR 76 480 lt/hr for MAR 106 lt/hr for MAR 126 1200 lt/hr for MAR 206 1600 lt/hr for MAR 306

Incoming water goes throughout the water regulating valve first and then to the water cooled condenser. Observe arrow on water regulating valve. Water supply must be installed to conform with local code. In some case a licensed plumber and/or a plumbing permit will be required.

Water Quality

Water quality is a factor of extreme importance for good operation of MAR machine. Water shouldn't be too hard neither too soft. Hard water will tend to create mineral deposits in water reservoir, evaporator drum and scraping blade, rendering rough the chute surface which prevents ice scales from sliding properly into ice channel. On the contrary, water too soft, (demineralized) will cause the ice skin to stick excessively on drum surface rendering difficult the scraping operation of same.

The ideal water should have a total hardness of about 15-20 french degrees.

Precaution Against Water Frost

Like for any other ice maker all necessary measures must be taken when the cold season is approaching to protect the water supply line and the MAR water system against winter freezing. If cooling tower is used several precautions should be observed, too.

1. Leave water regulating valve in the system.

2. Separate the make-up water for the reservoir from the tower water.

3. Use 3/4" tower water lines or larger, depending on the lenght of run. Over 30 feet, use 1" O.D. lines.

4. NOTICE: a cooling tower can freeze in the winter time and the MAR flaker will be in operation 12 months per year. An indoor tower and pump can be used with outdoors air ducted in and out if the fan cycles on water temperature to prevent freezing. An indoor sump can be used. An auxiliary tower and city-water hook-up will prove satisfactorily in some climates. Fresh water in the winter and tower water during the summer. Consult your tower and pump manufacturers for proper sizing. In no event should less than a Nominal 3 to 4 tons tower, or less than 3/4 HP high pressure tower, or less than 3/4 HP high pressure tower pump be used.

Page 13

C.Drain (When not re-used).

The recommenden tubes for the condenser waste line are:

- MAR 56-76 - 3/4" GAS female fitting.

- MAR 106-126 - 12 mm I.D.

- MAR 206-306 - 25 mm I.D. Water drip tray drain line is 21 m/m I.D. Tube to be connected with clamp to a 21 m/m hose barbed fitting for all models. Waste water line must run to an open trapped vented drain. If drain is a long run, allow a pitch of 3 cm per meter.

6. REMOTE AIR-COOLED CONDENSER AND PRECHARGED REFRIGERANT LINES INSTALLATION (MAR 306 ONLY)

Use the following for planning the placement of the condenser relative to the ice machine

Location Limits - condenser location must not exceed ANY of the following limits:

• Maximum rise from the ice machine to the

condenser is 3 physical meters

• Maximum drop from the ice machine to the

condenser is 1 physical meter

• Physical line set maximum length is 6 meters

• Line set length maximum is 9 meters.

Calculation Formula:

• Drop = dd x 6.6 (dd = distance in meters)

• Rise = rd x 1.7 (rd = distance in meters)

•

Horizontal Run = hd x 1 (hd = distance in meters)

• Calculation: Drop(s) + Rise(s) + Horizontal

Run = dd+rd+hd = Calculated Line Length.

Configurations that do NOT meet these requirements must receive prior written authorization from Scotsman.

Do NOT:

• Route a line set that rises, then falls, then rises.

• Route a line set that falls, then rises, then falls.

Calculation Example 1:

The condenser is to be located 0.9 meter below the ice machine and then 3 meters away horizontally.

0.9 mt x 6.6 = 5.94 + 3 = 8.94. This location would

be acceptable.

Calculation Example 2:

The condenser is to be located 4 meters above

and then 3 meters away horizontally.

4 x 1.7 = 6.8 6.8+3 = 9.8.

9.8 is greater than

the 9 maximum and is NOT acceptable.

Operating a machine with an unacceptable configurationg will void the refrigeration system warranty.

In a crate, separated by the unit crate are packed:

1. The air-cooled condenser mounted on the platform base with the electrical junction box, condenser shround, fan motors, fan protection grid, fan motor speed, control and the refrigerant lines connection couplings.

2. One set of pre-charged refrigerant line with connection couplings on both ends of following variety. Liquid I.D. 12 m/m - Gas I.D. 16 m/m

- 10 mts length.

The pre-charged refrigerant lines, 6 meters long, are equipped with self-sealing coupling connections and can be connected or disconnect few times without loosing the refrigerant charge.

The electric cord line, approx. 10 meters long, located on the left side of the unit has to be connected to the condenser junction box terminals. The condenser fan motors are originally wired for 230 V single phase and have the following specifications:

RPM 1420 WATTS 2x180 AMPS 2x0,80

They operate at 230 V 50 Hz and are controlled by an Electronic Fan Speed Control set at 16 bar.

A. Location consideration:

1. Limit to 10 meters the lenght of the precharged refrigerant lines from the ice-maker to the remote condenser.

2. Maximum vertical rise of 3 meters between the ice maker and the remote condenser.

3. Best available location, protected from the extremes of dirt, dust, rain, sun and wind.

B. Unpacking and inspection:

1. Visually inspect the exterior of the shipping container and any severe damage noted, should be reported to delivering carrier; and a concealed damage claim filled subject to internal inspection with carrier representative present.

2. Uncrate the remote condenser and precharged refrigerant lines and inspect for any concealed damage claims, as stated in step 1 above.

3. Check that the pre-charged refrigerant lines are intact, not kinked, and that there is no sealed puncture or loss or refrigerant.

Max 3 m

Max 1 m

Condenser Distance &

Location

Schematic

Remote

Condenser

Located BELOW

Ice Machine

Remote

Condenser

Located ABOVE

Ice Machine

Page 14

C. Remote condenser - Wall attachment

1. Install and attach the remote condenser to the wall of the building, using the methods and practices of building standards that conforms to and meets the local building code requirements in your area.

D. Remote Condenser Electrical connection

Connect t he electric cable from Remote Condenser to the terminal board of the machine as described in the following.

1. Remove jumper from contact 17 and 18 of the

machine terminal board.

2. Connect Remote Condenser BLU wire to

Neutral (N) of machine terminal board.

3. Connect Remote Condenser BROWN wire to

contact n. 18 of machine terminal board.

Connect Remote Condenser GREEN/YELLOW

wire to the grounding related screw.

E. Pre-charged refrigerant lines

1. The set of pre-charged refrigerant lines consists of a self-sealing liquid line and a selfsealing discharge line. One coupling on each line is fitted with a Schrader valve, which provides the servicemen with access for refrigerant evacuation through tubes, refrigerant charging and service gauges application when necessary.

2. When possible, route the maximum lenght of the pre-charged refrigerant lines inside the building, with the minimum lenght outside, to prevent vandalism and to minimize the

condenser effect that exposed lines can produce in cold weather. Insulate lines that be exposed to outside temperatures that will be below freezing, for extended periods of time.

CAUTION - Each coupling on the set of pre-charged refrigerant lines, the refrigerant fittings on the remote condenser and on the icemaker chassis are self-sealing and should be tightened 1/4 turn more than snug tight. ALWAYS USE TWO WRENCHES WHEN TIGHTENING THESE FITTINGS ONE AS A BACKUP WRENCH TO PREVENT TWISTING OF TUBING AND POSSIBLE KINKING OR LINE RUPTURE.

3. Connect the small dia refrigerant line coupling to the unit fitting labelled "LIQUID" on the right side of the icemaker chassis.

4. Connect the large dia refrigerant line coupling to the unit fitting labelled "GAS" on the righ side of the icemaker chassis.

5. Connect the small dia refrigerant line coupling with Schrader valve to the condenser fitting labelled "LIQUID".

6. Connect the large dia refrigerant line coupling with Schrader valve to the condenser fitting labelled "GAS".

F. Excess lenght of pre-charged refrigerant lines;

at installations where the icemaker chassisto-remote condenser refrigerant line path is substantially less than the lenght of precharged refrigerant lines to be installed, route and dress the excess refrigerant line as follows.

1. Follow straight line routing when possible.

2. Retain excess pre-charged refrigerant line inside the building.

3. Spiral the excess lenght of the precharged refrigerant lines in the best selected inside lo

cation and in a manner that prevents

refrigerant trapping.

Page 14

Page 15

CAUTION - DO NOT kink or crimp the refrigerant lines. DO NOT bend excess refrigerant lines in a vertical loop (s), which allow trapping of refrigerant in LOW sections during OFF time. Bend and shape excess refrigerant lines in VERTICAL spirals, not HORIZONTAL spirals. See Figure above.

7. ICE LEVEL CONTROL

The MAR flake ice system are equipped with and adjustable thermostatic control that cuts off ice making operation when its sensing bulb gets in contact with the ice deposited in the storage bin. The temperature range dial goes from +10°C to -35°C and its long capillary (3.5 m.) attaching the liquid filled bulb, should be conveniently positioned in the storage room at the desired height by holding it with an appropriate bracket to be arranged in accordance with the location possibilities. These controls may or may not be used, it depends of storage room arrangement and its inner temperature that must be higher, anyway, to that of the ice produced. In case of a prevailing low themperature (below

-20°C) created by the sub-cooled ice that is staging above the ice level, which will prevent a positive function of the ice level thermostatic control, the thermostatic sensing bulb must be removed from the storage room. The MAR ice system are also equipped with a timer which allows to present the system operations time in relation to the quantity (level) of the ice desired. This timer function takes place of the ice level control.

8. ICE CHUTE

Mar compact unit are supplied with its own ice chute. In addition optional kits for various solutions are available on request.

9. FINAL CHECK LIST

1. Is the cabinet level 3 (IMPORTANT).

2. Have all electrical and piping connections been made?

3. Has the voltage been tested and checked against the nameplate rating?

4. Is the water supply line shut-off valve installed and electrical wiring properly connected?

5. Have the Bin and Cabinet benn wiped clean?

6. Have the compressor hold down bolts been en checked to be sure the compressor is floating on the mounting springs?

7. Has the owner/user been instructed on how to operate the ice maker?

8. Has the Manufacturer's Registration Card been properly filled out? Check for correct Model and Serial numbers from serial nameplate then mail the completed card to the Frimont Scotsman Europe Factory.

9. Check all refrigerant lines and conduit lines, to guard against vibration or rugging and possible failure.

10. Is the cabinet in a room where ambient temperatures are a minimum of 5°C (40°F) all year around?

11. Has water supply pressure been checked to insure a minimum of 1 bar (14 psi) and max of 5 bar (70 psi)?

12.Has the owner been given name and telephone number of the authorized SCOTSMAN Service Agency serving him?

1 Power supply line 2 Hand disconnect switch 3 Water supply line 4 hand shut off valve 5 Water filter 6 Water supply in.

(Run separate water inlet

for condenser) 7 Water drain line 8 Open trapped or vented drain

10. UNIT INSTALLATION PRACTICE ON NON-REFRIGERATED ICE-ROOM

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11. UNIT INSTALLATION PRACTICE ON REFRIGERATED ICE STORAGE ROOM (Jacket system)

1 Power supply line 2 Hand disconnect switch 3 Water supply line 4 Hand shut off valve 5 Water filter 6 Water supply in.

(Run separate water inlet

for condenser) 7 Water drain line 8 Open trapped or vented drain 9 REFRIGERANT COIL 10 Insulated panel 11 Air gap 12 Ice bulkhead

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SEZIONE II

OPERATING INSTRUCTION

1. COMPLETE UNIT START-UP

1. Remove all panels and open the water supply line shut-off valve for both the evaporator drum and in the case of a water cooled machine, to the condenser.

2. Observe the water filling operations.

a) Water flows into the float reservoir first. b) Water is filling the freezing drum basin. c) Float moves up as water level rises in water

reservoir.

d) Float stops water flow when water reaches

suitable operation level. Now, water surrounds bottom half of freezing drum.

3. Move the manual ON-OFF toggle of main disconnect switch to ON position. The green light on console panel will glow.

4. MAR uses an electrical "three phases monitoring relay" which alerts installer in case of wrong wiring by keeping green LED ON only. In this case change phase connection wiring.

5. Correct wiring is shown by both LEDs Green and Orange steady ON together.

6. Observe immediately that evaporator drum rotates in the right direction, namely toward the scraping blade.

7. Meanwhile unit is under power KT1 relay compressor device is energized as well in order to delay compressor start up by 18' Later (KT1 orange LED blinks during this delay). On normal operation - compressor ON - KT1 LEDs (orange and green) are steady ON together.

NOTE. In case on any temporally Ice maker trip OFF (not alarm) due to NO/LOW water pressure, bin full, ice spout switch activation

unit stops by only keeping drive motor operating

for 18' in order to clear evaporator by ice. KT2 delay relay LEDs steady ON (orange and green) during this delay.

WARNING - Correct Drum rotation - The evaporator drum drive motor is a threephase motor wired for 400 V. It is of extreme importance to check immediately upon unit start-up that motor rotates CLOCKWISE in order that gear motor pulley rotates in the direction of the ARROW. Should the motor turn counterclockwise, it is necessary to instantly switch-off the unit and interchange one polarity at terminal block connection of main electric cord.

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Motor Shaft Pulley

MAR units are generally equipped with two pulleys (not on MAR 126) and by changing from one to the other the speed of drum can be changed. MAR Machines are factory delivered with pulley to rotate the evaporator drum at the lowest possible R.P.M. to obtain "THICK" (2 mm gauge) scale ice. Replacing standard by alternative/supplied pulley on motor shaft evaporator drum R.P.M. increases to the point to produce "THIN" (1 mm gauge) scale ice.

8. Make sure that the automatic expansion valve opens and that refrigerant fluid starts to flow through it.

NOTE. At first compressor start-up, the suction pressure declines rapidly to 0.2 bar, causing the intervention of the pressure control, which will interrupt the entire unit operation. This control being automatic re-set type, will resume the unit operation after few seconds. The unit will start and stop few more times, due to the lo-pressure control cut-out and in, until system refrigerant pressure set on their normal values.

9. After two or three minutes of operation, observe that ice skin begin to form on the revolving drum surface and it is scraped by the blade.

10.Left the system operate for about 20 minutes. Check for any excess noise beyond normal compressor noise.

a) Vibrating type from touching lines.

b) Compressor loose at one or more holddown

bolts.

c) Drivemotor pulley misaligned with gear box

pulley causing V belt vibration.

d) Check compressor oil level through sight

glass (Except MAR 56/76/106/126).

11.On water cooled machine check the water flowing out from condenser to see if it is correct. Cooling water flow is controlled by a pressure water regulating valve. No valve adjustment of water valve should be necessary unless the inlet temperature of cooling water is relatively high. Normal head pressure should be 17 bar on MAR 56, MAR 76, MAR 106 and MAR 126; 16 bar on MAR 206 and 14 bar on MAR 306.

12.Observe that evaporator drum is frosted allover from end to end. If this is not the case setting of the refrigerant expansion valve may be necessary. For proper adjustment of this valve turn the valve setting steam of one eight of a turn counterckwise to allow more refrigerant flow until the evaporator drum surface is evenly frosted from end to end. In case you have an excessive frost back in the suction line and frost starts to form on compressor suction service valve slightly turn clockwise the expansion valve setting stem until the frost back on compressor service valve melts over.

The suction pressure should range between 0.6 bar and 2.5 bar depending on model, water temperature and level.

See indications on page 25.

2. WATER AND REFRIGERANT CIRCUIT

1. Compressor

2. Condenser

3. Discharge line

4. Drier

5. Liquid line

6. Heat exchanger

13. Drum water basin

14. Evaporator drum

15. Refrig. lines manifold.

16. Scraping blade

17. Float reservoir

18. Spray bar

7. Expansion valve

8. Vapor line

9. Vibration absorbers

10. Condensing water-inlet

11. Condensing water-outlet

12. Water regulating valve

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WARNING - Whenever stopping the machine to keep it off operation for some time, it is recommendable to shut close the water inlet valve to interrupt the water supply.

13. Throughly explain the owner/user the significant specifications of the MAR ice maker, the start-up and operation, going through the procedure in the operating instructions. Answer all questions about the icemaker, by the owner and inform the owner of the name and telephone number of the Scotsman Service station serving him.

14. Fit and secure all unit panels previously removed.

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SECTION III

PRINCIPLES OF OPERATION - HOW IT WORKS

1. ICE MAKER

The revolving drum which may be of different size depending on the ice maker capacity, is basically made of a cylinder skeleton covered by a stainless steel jacket. A channel, about 15 m/m deep and 15 m/m wide is machined in a spiral pattern that goes from one end to the other of the cylinder skeleton. The end of the machined channel communicate with a bore made in the left cylinder journal. The head manifold on the left side is for both liquid refrigerant inlet and vapor refrigerant outlet. When cylinder metal jacket is forced and sealed on the cylinder skeleton, the spiral pattern channel made for the refrigerant flow becomes virtually the evaporator serpentine. The metered refrigerant that reaches the evaporator serpentine by passing throught the bore in the left side cylinder journal, boils and evaporatores as it comes in contact with the drum metal jacket. About one third on the cylinder drum is constantly submerged in water. This will allow the cylinder metal jacket to draw a film of water that, as soon as it comes afloat, freezes almost instantly due to the heat absorption created by the boiling refrigerant circulating in the inner serpentine and scrubbing with the jacket inner surface.

2. PRINCIPLES OF OPERATION - HOW IT WORKS

The ice layer of the emerged cylinder sector has a fraction of time to solidify, dry and eventually subcool before contacting the edge of the horizontal scraping blade. The scraping blade, of heavy duty metal, cause the peels off of the ice sheet formed on the drum jacket by racking it while it advances on the revolving drum.

The ice sheet is so dry that, when it gets in contact with the scraping blade, it cracks in a form of irregular shaped chips. The refrigerant leaves the evaporator serpentine to return to the compressor via suction line through the bore of the head manifold on the left side cylinder. The refrigerant sealing in the manifold is assured by an especially designed sealing device. The cylinder is driven by a separate drive motor and gear reducer located on the right side. Four motors are constantly in motion:

a) the compressor b) the drive motor c) the fan motor d) water pump

The gear reducer, the driving belt with its pulley and the revolving drum with the rotating part of the sealing devices are the mechanical parts in motion.

1. Water drawing area

2. Water sprayed freezing cooling area

3. Sub-cooling area

4. Water reservoir float valve

5. Water feeding line

6. Scraping blade

7. Spray bar

8. Water reservoir

9. Revolving drum

10. Water pump

11. Water drain hole

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3. ELECTRICAL / REFRIGERATION

The electrical circuit consists of the compressor motor, drive motor, water pump, condenser fan motor and control (on air cooled version), main controls (ON-OFF compressor Switch - Timer Contactor), safety controls - Thermal protection for compressor - Hi and Lo pressure switches water failure switch, compressor and drive motor delay timer, three phases monitoring relay.

A. Compressor unit - (see Technical Specifi-

cation Table for H.P.). The compressor used on the MAR 56 - 76

- 106 - 126 is hermetic reciprocating type compressors while on MAR 206 and 306 is semihermetic type. All of them operating with R 404a. All compressors are equipped with a crankcase heater element and are thermally protected. Cooling is achieved with refrigerant passing through suction valve and by a separate fan motor on water cooled version only.

a) Compressor Crankcase Heater

Must be constantly energized particularly during OFF period of ice maker operations. The temperature provided by the heating element into the crankcase prevents that refrigerant dilutes with oil.

b) Compressor Thermal Protector

(Thermistor) on MAR 206 and 306

A thermistor is a solid state semiconductor which permits or allows more electrons to flow throught it as the material's temperature increases. Today thermistors are used in place of a bimetal strip or in place of a temperature sensitive power element as a safety device in electric motors by stopping the electric power flow to a motor if the motor windings temperature increases to the danger point.

B. Drive Motor

The evaporator drum drive motor is a three phase motor of 1/2 HP wired for 380/220 Volts 50/60 Hz - 1,2/2,1 Amps - 1400 R.P.M. with inherent thermal protector. IMPORTANT - When this motor is disconnected or the entire unit is disconnected, it is necessary - when resuming the electrical

connection to immediately make sure that drive motor rotates clockwise facing the unit front.

Failure to this, may result in wrong rotation of evaporator drum with the risk of major damages to the system.

C. Timer

It will be mainly used to pre-set the system operation time in relation to the desired amount to ice. Therefore it takes the function of an Ice Level Control in the storage area. This timer can be remotely located if desired.

D. Hi Pressure Cut-Out Hand Reset

This high pressure control prevents operation at high refrigerant pressure. Shuts-off entire system in case of water failure to condenser on water cooled units and of fan motor failure on air cooled machines. Factory cut-out setting are:

air cooled 34±2 bar (480±30 psi) water cooled 30 bar (420 psi)

E. Water Failure Switch

This switch used as safety device when low or interrupted supply water conditions are encountered. Operates on pressure between supply line and feed line to water reservoir. Range is 0.5 bar (7 psi) off and 0.8 bar (12 psi) on. Cuts off complete unit and Resets automatically.

F. Lo-Pressure Cut-Out Automatical Reset

Lo Pressure Control prevents operation at vacuum refrigerant suction pressure. Shuts off entire system in case of refrigerant failure in the system. Factory setting cut-out: 0,2 bar.

G. Condenser Fan Motor

Air Cooled Units

The fan Motors used are permanent capacitor type fan motors. Electrical supply to the fan motors is 230 V, 50 Hz - 0,7 Amp. for MAR 56, 76, 106, 126 10 and 306 - 0,9 Amp. for MAR 206.

H. Fan Motor Pressure Control

MAR Air Cooled version are equipped with a pressure control which is a reverse acting automatic re-set control directly connected to the fan motor. Its function is to maintain the head pressure between the cut-in and cut out setting values which are 15÷17 bar.

I. Control Console

Located on the front of the unit cabinet, is a visual control console that monitors unit performance automatically. Any interruption or significant reduction in water or electrical supply causes an instant stop to the operation of the MAR flaker system. At the same time a warning light is activated on the control console telling the user of the ice maker stoppage and also the reason why.

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If the stoppage is caused by its refrigerant pressures or overloading in the compressor a red light glows. Both controls that activate the red lights are manual reset type controls, therefore the cause of the stoppage should be diagnosed and corrected before reoperating the ice maker.

J. Water Cooled Condenser

Tube within a tube condenser.

K. Water Regulating Valve

Penn made. Valve must be set to maintain head pressure at 17 bar (240 psi) for MAR 56-76, 15 bar (210 psi) for MAR 106-126, 16 bar (225 psi) for MAR 206 and 14 bar (195 psi) for MAR 306.

L. Automatic Expansion Valve (A.E.V.) M.O.P.

The automatic expansion valve controls the refrigerant when passing from the liquid line to the evaporator. As the pressure decreases on the low side, the expansion Valve open and refrigerant escapes into the evaporator drum channel where it absorbs heat from water while evaporating. The valve maintains a constant pressure in the evaporator coil when the system is running indipendently of the amount of refrigerant in the system. This valve has an adjustment which may be manually regulated to give the evaporator coil the desired amount of refrigerant. Turning the adjustment to the left, counterclockwise, will increase the rate of flow which is controlled by the pressure in the evaporator. When the compressor is not running the valve will remain closed as the low side pressure will be high enough to close the expansion valve.

- MAR 56 -76 - 106 - 126 are generally equipped with an expansion valve having an orifice of 2,5 mm set for 3,0 bar of pressure.

- MAR 206 - 306 is also equipped with an expansion valve having an orifice of 4,5 mm set for 3.0 bar of pressure.

M. Evaporator Drum

Refrigerant inlet/outlet takes place on left side journal. The drum body is covered by a jacket in special stainless steel resistant to the water corrosion. The front edge of the scraping blade must have a clearance of minimum 0.05 mm from cylinder metal jacket.

N. Refrigerant Seal System

Housed in the refrigerant inlet/outlet manifold located on the evaporator drum left side journal, is a leakproof joint. This joint is made with seals that are carefully designed and installed. The seals use two rubbing surfaces. One surface tourns with the cylinder journal and is sealed on it with on O ring of synthetic material. The other surface is stationary and fitted in its housing with leak-proof O ring. The rubbing surfaces (optically flats) are made of two different material that are: hardenend steel for the rotating ring and graphite for the stationary ring.

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The rotating parts are: a) the clip retainer ring b) the spring collar c) the compression spring d) the stainless steel seal ring with O ring.

The stationary parts are: a) the graphitic ring with O ring b) the stainless steel housing ring with gasket

and O rings.

O. Heat Exchanger

A heat exchanger is mounted in the suction and liquid line to reduce flash gas in the liquid line, to reduce liquid refrigerant in the suction line and to subcool the liquid refrigerant thereby increasing the operating efficiency.

P. Sight Glass

A sight glass is installed in the liquid line. The sight glass will show bubbles if the system is low on refrigerant.

Q. Filter Drier

All MAR units mount a "Solid-core antiacid filter drier" on liquid line. This drier may be installed in any position provided that the arrow on its body point in the direction of refrigerant flow.

R. Contactor

MAR contactors have 3 or 5 contacts normally open and 1 contact normally closed. The N.C. contact is generally used to keep the crankcase heater energized during the OFF periods. The contactor coil is generally at 230 V 50 Hz 1 Ph and kept energized by the system controls that are connected in series.

S. Thermostat (Ice level control)

When storage room temperature is higher to that of the ice being made, the ice level can be positively controlled by this thermostat, the sensing bulb of which must be positioned to the wanted level that will, abviously correspond to the desired ice level in storage room. The temperature range dial must be set on to the proper temperature in order that the control may cut-out or may cut-in respectively when its sensing bulb gets buried into the ice cone and when is freed from the ice.

This thermostat can be a valid control if it is used in non-refrigerated storage rooms as in these cases it is influenced just by the ice temperature.

T. Ice Spout Safety Switch

Located on top of the Ice Spout, the Safety Switch is operated by a plate on top of the ice chute by the ice backing up in the spout. The switch will shut-off the entire ice making mechanism.

U. Ice Level Control

Must have its sensing capillary extended into ice room in a way that it could be contacted by the ice when storage ice room becomes filled. It terminates ice production when its capillary gets in contact with ice. It is wired in series with all other controls. It is factory set to cutout at 1,5°C and cut-in at 4°C.

V. ON/OFF switch

The manual start-up or switching of the entire system requires the attention of the operator who may instantly keep control of the situation, supplied.

W.Compressor Delay timer

Delays the start up of the compressor by 18' at every start up of the ice maker. Supplied.

X. Drum rotation delay timer

Delays drum STOP by 18' at every trip OFF of the ice maker. Supplied.

Y. 3 - phases monitoring relay

On the power IN, it checks and assures correct rotation of the drive motor - evaporator drum. Supplied.

Z. Drum rotation control

It operates using the Hall effect sensor / principle. In case the drum is not rotating at all (or it rotates too slow - less then 1/4 turn every 30") such relay trips the unit OFF so to avoid that in case of fiber keys breakage, the drive motor - gear reducer and compressor can operate with the drum OFF. Supplied.

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4. REFRIGERANT CHARGE WATER COOLED MODELS

The below refrigerant charge is approximate. When charging, set at 15 or 17 bar head pressure according to the model and charge so that frost line extends out of the evaporator two third way to compressor after fifteen minutes of operation.

AIR COOLED MODELS

When charging set at 16 bar (225 psi) the head pressure.

5. MECHANICALS

A. Motor Shaft Pulley

MAR units are generally equipped with two pulley and by changing the belt from one to the other, the speed of drum can be changed. MAR Machines are factory delivered with pulley to rotate the evaporator drum at the lowest possible R.P.M. to obtain "THICK" (2 mm gauge) scale ice. Replacing standard by alternative/supplied pulley on motor shaft evaporator drum R.P.M. increases to the point to produce "THIN" (1 mm gauge) scale ice.

R.P.M. R.P.M.

for "thick" ice for "thin" ice

MAR 56 AS/WS 0.9 1.25 MAR 76 AS/WS 1.1 1.25 MAR 106 AS/WS 1.5 2.3 MAR 126 AS/WS 2.4 **** MAR 206 AS/WS 1.05 1.6 MAR 306 AS 1.6 2.9 MAR 306 WS 1.8 2.9

V belts used on motor shaft pulley and gear box are type:

MAR MAR MAR MAR MAR MAR 56 76 106 126 206 306

XPZ750 XPZ 900 XPZ 937

B. V Belt

V belt used on motor shaft pulley and gear box. When changing the V belt be careful to adjust it for proper tension and alignement. It should be snug not tight. A way to roughly check belt tension is to apply a firm hand pressure in the middle of the longest belt span. If the belt is correctly tensioned, you should be able to depress it about 10 m/m out of line.

C. Gear Reducer

Then gear reducer is mounted on the right side frame of evaporator drum basin to which it is firmaly secured with four nuts. The gear reducer bore in which passes the drum shaft to be driven, has a keyway. Two fiber keys are used to engage the gear reducer to the drum shaft, they are in series in the gear reducer bore, and shaft keyways. Should the driving strain be excessive, the two fiber keys will shear. MAR 56-76-106-126 are equipped with a gear reducer having a ratio of 1/600. MAR 206 and 306 have a gear reducer with a ratio of 1/552. The gear reducers are greased for life, therefore they do not require any maintenance.

REFRIGERANT CHARGE AND OPERATING PRESSURES

MAR 56-76 MAR 106 MAR 126 MAR 206 MAR 306

A WAWAWAW AW

Refrig. charge (gr) 1500 1000 2000 1150 2200 1250 4100 2300 5900 2500 Head press. (bar) 15-17 17 15-17 15 15-17 15 15-17 16 15-17 14 Head press. (psi)

212-245

245

212-245

212

212-245 212 212-245

230

212-245

200 Suction press. (bar) 2.2 1.8 1.6 1.6 1.6 1.6 1.9 1.9 1.0 1.75 Suction press. (psi) 32 26 23 23 23 23 27 27 14 11

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SECTION IV

ADJUSTMENT & REMOVAL & REPLACEMENT PROCEDURES

The procedures provided in this section are arranged in order to make specific adjustment and removal and replacement information easy to locate. Read the instructions throughly before performing any adjustment or removal or replacement procedures.

1. ADJUSTMENT OF THE WATER REGULATOR ASSY (Water Cooled Models)

Adjustements can be performed on the Water Regulator Assembly to increase or decrease the head pressure. To adjust the Water Regulator Assembly:

A. To INCREASE the Head Pressure: rotate the

adjusting screw on the Water Regulator Assembly IN or CLOCKWISE.

B. To DECREASE the Head Pressure: rotate

the adjusting screw on the Water Regulator Assembly OUT or COUNTERCLOCKWISE.

2. ADJUSTMENT OF THE AUTOMATIC EXPANSION VALVE

The end to end frost on evaporator drum is the result of the correct expansion valve setting. This valve may be manually regulated by means of the adjusting stem. Turning the adjustment to the left counterclockwise, will increase the rate if refrigerant flow. Turning the adjustment to the right (clockwise), the refrigerant flow to the evaporator is reduced. Use hex head wrench for manual adjusting operations.

WARNING - Be sure the electrical power supply and water supply are OFF, before starting any of the following REMOVAL AND REPLACEMENT procedures as a precaution to prevent possible personal injury or damage to equipment.

3. CHANGING V BELT FROM SMALLER

PULLEY GROOVE TO LARGER PULLEY GROOVE TO MAKE THIN ICE.

1. Remove top, front right panel and right side

panels.

2. Through the front, by means of socket wrench,

slightly unloose two head hex screw securing the sleigh that supports the motor.

3. Through the right side, slightly unloose the nut located in correspondence of the sleigh button hole.

4. The sleigh with the motor should be able to slide vertically.

5. Slid-off V belt from motor pulley.

6. Unloose and remove hex head screw that secure step pulley on motor shaft.

7. Remove step pulley from motor shaft and replace the same with alternative-supplied one.

8. Tighten pulley on motor shaft by means of hex head screw previously removed.

9. Place V belt on groove of motor pulley and of gear box pulley.

10. Raise the sleigh with motor and pulley to give a rough tension to V. Belt.

11. Tighten slightly the two hex head bolts and the nut previously unloosed.

12. Correct tension of V belt by moving upward or downward the Sleigh/Drive Motor assembly.

13. When satisfied with V belt tension, which should be snug but not tight, proceed to definitively tighten the hex head bolts and nuts that secure motor support sleigh to side frame of drum basin.

4. REMOVAL AND REPLACEMENT OF THE

COMPRESSOR ASSEMBLY

NOTE. Always install a replacement Drier,

anytime the sealed Refrigeration System is opened. Do not replace the Drier until all other repairs or replacements have been completed.

A. To remove the Compressor Assembly:

1) Remove cover from the Compressor Junction

Box.

2) Disconnect the electrical leads at the

Compressor Junction Box that originate in the Control Box.

3) Recover the refrigerant from the system and

transfer it in a bottle so to reclaim or recycle it.

4) Disconnect the suction line from the

compressor.

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5) Disconnect the discharge line from the compressor.

6) Remove four bolts, lockwashers and washers which secure the compressor to the Chassis mounting base.

7) Slide the compressor and remove it through the rear side opening of the Cabinet.

B. To replace the Compressor Assembly, reverse

the removal procedures.

5. REMOVAL AND REPLACEMENT OF THE WATER COOLED CONDENSER.

NOTE. Always install a replacement Drier,

anytime the Sealed Refrigeration System is opened. Do not replace the Drier, until all other repairs or replacements have been completed.

A. To remove Condenser:

1) Recover the refrigerant from the system and transfer it in a bottle so to reclaim or recycle it.

2) Unsolder the refrigerant inlet and outlet lines from the condenser.

3) Disconnect the water inlet and outlet lines from the condenser.

4) Remove bolts, lockwashers and washers which secure the Condenser to the Chassis mounting base.

5) Remove the Condenser from cabinet.

NOTE. Throughly evacuate the System to remove moisture and non-condensable.

B. To replace the Condenser, reverse the

removal procedures.

6. REMOVAL AND REPLACEMENT OF THE WATER REGULATOR ASSEMBLY (Water-cooled Models)

A. To remove the Water Regulator Assembly:

1) Recover the refrigerant from the system and transfer it in a bottle so to reclaim or recycle it.

2) Unsolder the capillary line from the Water regulator assembly where connected at the process header.

3) Disconnect the water inlet line at the rear of the water regulator.

4) Disconnect the condenser water inlet tube at the front of the water regulator.

5) Remove two screws, lockwashers and washers which attach the Water Regulator Assembly bracket to the Chassis base and remove the Water Regulator Assembly and bracket.

NOTE. Throughly evacuate the System to remove moisture and non-condensables.

B. To replace the Water Regulator Assembly

reverse the removal procedures.

7. REMOVAL AND REPLACEMENT OF THE DRIER

A. To remove the Drier:

1) Recover the refrigerant from the system and transfer it in a bottle so to reclaim or recycle it.

2) Unsolder the refrigeration lines at each end of Drier and remove the Drier.

B) To replace the Drier:

CAUTION - 1. If the factory seal is broken on the replacement drier, exposition it to the athmosphere, more than a few minutes, the Drier will absorb moisture from the atmosphere and loose substantial ability for moisture removal.

2. Be sure the replacement Drier is installed with the arrow positioned in the direction of the refrigerant flow.

1) Remove the factory seals from the replacement drier and install the drier in the refrigerant lines with the arrow positioned in the direction of the refrigerant flow.

2) Solder the refrigeration lines at each end of drier.

3) Purge the system and check for leaks.

4) Throughly evacuate the system to remove moisture and non-condensables.

5) Charge the system with refrigerant, by weight. SEE NAMEPLATE.

6) Re-mount all Service Panels.

8. INSTRUCTION FOR REMOVAL AND REPLACEMENT OF REFRIGERANT MECHANISMS OF SCOTSMAN ICE MAKERS "MAR" SERIES

1. Before removing the refrigerant manifold it is necessary - at first - to close the valve on liquid line. Upon low pressure switch cut-off, the main switch must be put in "OFF" position,then it is necessary to purge the refrigerant system. After these operations, the flare fitting at the inlet of refrigerant manifold can be disconnected as shown.

2. Remove the 4 allen screws of refrigerant outlet fitting to manifold.

Unloose and remove the 6 nuts with respective washers that secure the refrigerant manifold (1).

4. When removed the refrigerant manifold unloose and remove one of the three screws (11) securing the seal mechanism ring to the drum shaft journal.

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5. Fit in place of it the screw of 4 MA supplied in the kit then tighten its nut.

6. Gradually unloose the two remaining screws and the nut till release the spring of seal mechanism.

7. Unloose the last screw to remove the seal mechanism ring as well as the seal mechanism S.S. ring and its spring.

8. Withdraw entirely the stainless steel ring (6)

that houses the graphitic seal ring.

9. Check to see the surface conditions of

cylinder shaft journal. It is of extreme importance that this surface be clean, smooth and polished.

In case of scored surface it is necessary to stroke on it a very fine sand paper stripe. Check to see that washer (5) be properly clean and positioned with keyway to match the key.

10. If necessary replace the 0 rings of the S.S. ring that houses the graphitic ring.

11. Proceed attentively to examine the graphitic sulface of the seal ring. If this surface is no more perfect and optically flat, proceed to replace the seal ring in the following way. Lubricate the outer surface of the new seal ring with compressor oil and place it at the inferior of the housing ring.

12. Place on drum shaft the steel ring housing the graphite.

13. Mount on drum shaft journal the remaining portion of seal mechanism (S.S. ring and spring) (9) then the seal mechanism ring (10).

14. Fit the screw of 4 MA with its nut in one of the three threaded holes then screw down the nut in order to compress the spring.

15. When the seal mechanism spring has been partially compressed fit the other two screws and full compress the spring by screwing down gradually the three tightening point.

16. After have tightened the screws unloose the

tie rod screw and replace it with the third one.

17. Clean carefully the inner surface of refrigerant manifold. Check to see the good condition of the seal ring (8) and fit it in its seat inside the refrigerant manifold. Fit on shaft end the washer (12) which keeps in place the seal ring (13) inside the refrigerant manifold and fit inside the manifold the gasket.

18. Position the manifold on the six monting studs, fit the six mounting nuts and washers and tighten all them down by means of a 10 mm. wrench.

19. Connect the outlet refrigerant line to the corresponding port of the manifold and tighten it with the four head necessed screw.

20. Connect the refrigerant inlet line on its manifold fitting and tighten the fitting flarenut.

9. REMOVAL AND REPLACEMENT OF THE DRIVE MOTOR

A. To remove the drive motor assembly:

1) Remove screws and front, top and right side panels.

2) Slid-off V belt from motor pulley.

3) Unloose and remove hex head screw securing the pulley to motor shaft.

4) Disconnect wire leads to motor.

5) Remove two hex head bolts, lockwashers and washer, and nut which attach the sleigh support plate of motor to the side frame of evaporator drum basin.

6) Lift the sleigh plate with the drive motor out of the Chassis.

7) Unloose and remove 4 Nuts securing the motor to the sleigh plate.

B. To replace the Drive Motor Assembly reverse

the removal procedure.

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10. REMOVAL AND REPLACEMENT OF GEAR BOX

A. Remove screws and front, top and right side

panels.

1) Slid-off V Belt from gear box pulley.

2) Remove screw securing pulley on gear box inpul shaft.

3) Remove four nuts and washers which secure the gear box to the evaporator basin side frame.

4) With a mallet hit a bit the gear box to create some looseness.

5) With the help to two screw driver inserted between basin wall and flanged end of gear box, force the gear box to clear away from basin wall if you encounter an excessive resistance in this. It better to use a Puller.

6) When gear box is cleared away from the wall where it is mounted, pull it out from cylinder shaft.

B. To install the Gear Box Assembly reverse

the removal procedure taking care to center keyway of gear box bore to keys on cylinder shaft.

11. REPLACEMENT OF FIBER KEYS

A. The replacement of fiber keys is necessary

only when the keys are broken, so that they do not engage the gear motor with the evaporator drum drive shaft. In practical terms, the gear box does not drive the evaporator drum.

B. To reach the fiber keys to be replaced it is

necessary to remove the complete gear box. For this operation perform all steps at point

11.

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SECTION V

MAINTENANCE & CLEANING INSTRUCTIONS

1. GENERAL

The periods and procedure for maintenance and cleaning are given as guides and are not to be construed as absolute or invariable. Cleaning especially will vary depending upon local water conditions and the ice volume produced and each ice maker must be maintained individually in accordance with is own particolar location requirements.

2. ICEMAKER

THE FOLLOWING MAINTENANCE MUST BE SCHEDULED AT LEAST TWO TIMES PER YEAR ON THIS ICE MAKER. CALL YOUR AUTHORIZED SCOTSMAN SERVICE AGENCY.

1. Check and clean water line Strainer in water inlet fittings.

2. Remove top panel and evaporator cover depress the float to ensure that a full stream of water enters Drum Reservoirs.

3. Check that the ice maker cabinet is level in side-to-side and front-to-rear directions.

4. Clean the drum basin and exterior of the drum assembly using a solution of SCOTSMAN Ice Machine Cleaner. Refer to procedure VI-3, CLEANING ICE MAKER.

NOTE. Cleaning requirements vary according local water conditions and individual user operation.

5. When doubtful about refrigeration charge, check gauge for compressor head pressure. Please refer to the operating pressures as printed on page 26.

6. Check gauge for Suction Line Pressure which varies between:

2.2 bar (32 psi) MAR 56-76 AS

1.8 bar (26 psi) MAR 56-76 WS

1.6 bar (22 psi) MAR 106-126 AS-WS

1.9 bar (27 psi) MAR 206 AS-WS

1.0 bar (14 psi) MAR 306 AS

0.75 bar (10 psi) MAR 306 WS Depending upon water inlet temperature.

7. Check setting and function of all the pressure controls also make sure that their corresponding lights will glow.

8. Check drive motor operation. Normal operating temperatures are about 60°C (160°C) which is hot to touch. Check with amperometer Amps drawn.

9. Check V belt for concealed signs of wear and that has the correct tension. Check pulleys alignements and also that drive motor and gear box hold down bolts are tight enough.

10. Make sure that water lines in water cooled condenser are free from any excess of water minerals: otherwise arrange to clean the tubes with a power driven wire brush or running through it a weak acid solution made with 20 percent of hydrocloric acid.

11. Check for refrigerant leaks and for proper frost line, which should frost out of accumulator at least half way to the compressor and in some areas, back to service valve.

12. Check for water leaks. Tighten drain line connections. Pour water down drain to be sure that drain line is open and clear.

13. Check the quality of ice. Ice flakers should be dry and have a thickness gauge of about

1.5÷2.0 m/m.

14. Check the thermostatic Ice Control Bulb (whenever used) location and thermostatic function.

15. Check compressor oil level through sight glass (where used). Stop unit operation and after 10" see that oil level is 2/3 millimeters above center line of sight glass.

16. Be sure that plexiglass chute at spout opening is securely fastened with is hold down button and that its surface is smooth and clean from any water mineral deposit.

3A.CLEANING INSTRUCTION

(MAR 56-76-106-126)

1. Disconnect power front the unit.

2. Remove screws and top panel

3. Remove evaporator cover panel

4. Close water inlet valve located at evaporator side onto water inlet line.

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5. Press water hose clamp in order to release it

6. Lift the water pump up to release it from sliding holding screw

7. Carefully push little bit water sump bracket

in ordet to release it

8. Lift the water reservoir up for a while and bend it in order to dump contained liquid

9. Push water hose quick fitting ring

......to release the nylon tube

......and remove water sump from evaporator

basin

10. By the help of flat screwdriver easily open little bit float valve holding arms and remove it from holders

11. Check nozzle orifice condition. In case of obstruction clean it by pin

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20. Plug IN the ice maker and let the unit in

operation for about 10 minutes.

21. Disconnect again unit from power.

22. Repeat again from #5 to #9 thus to dump

reservoir from chemical solution and later rinse all parts by fresh water.

23. Reinstall all removed part from #9 to #5.

24. Prepare as per #12 using SCOTSMAN

sanitizer rather then cleaner. Possible sanitizing solution could be by mixing 1,5 cl (5 oz) of sanitizer with 5 lt (1 gallon)

NEVER MIX CLEANING WITH SANITIZING SOLUTION

25. Pour sanitizing solution in the water reservoir.

26. Plug IN again the unit and let the sanitizing

solution re-circulating for about 5 minutes.

27. Repeat #5 to #8.

28. Lift the water sump up for a while in order to

dump sanitizing solution stored in the same then relocate the same.

29. Reinstall water pump and connect water inlet

hose.

30.

Open water inlet valve previously closed at #4.

31. Ice produced during the first 5 minutes must

be thrown away in order to avoid any possible chemical contamination.

CAUTION - NEVER use ice produced from any chemical solution. Be sure none falls into storage bin.

3B.CLEANING INSTRUCTION

(MAR 206-306)

1. Disconnect power front the unit.

2. Remove screws and top panel

3. Remove evaporator cover panel

12. Prepare a solution in a bucket by mixing 1/2 liter of SCOTSMAN CLEANER with 5 liters of warm (40-50°C) water.

WARNING: When using any chemical, wear hands protection (gloves). SCOTSMAN Ice Machines Cleaner contains phosphoric and Hydroxiacetic acid. These compound are corrosive and may cause burns if swallowed. DO NOT induce vomiting. Give large amount of water or milk. Call Physician immediately. In case of external contact, flush with fresh water. KEEP OUT OF THE REACH O CHILDREN.

13. Dip the water reservoir removed at #7 into

the cleaning solution and clean it by sponge and/or suitable brush.

14. Once reservoir is duly cleaned, dump float

valve in the solution and remove any kind of scale or mineral deposit then rinse the same by fresh water.

15. Place again float valve into its bracket

16. Reinstall water sump with float valve.

17. Reinstall water pump removed at #6.

18. Reconnect water inlet hose removed at #5.

19. Slowly pour the solution mixed at #12 in the

water reservoir till to 2 cm (7,87") below top edge.

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4. Close water inlet valve located at evaporator

side onto water inlet line.

5. Bend down the plastic hose and drain out

rthe water from the water sump than move it up again.

6. Prepare a solution in a bucket by mixing 1 liter of SCOTSMAN CLEANER with 10 liters of warm (40-50°C) water.

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7. Slowly pour the solution mixed at #6 in the water reservoir.

8. Plug IN the ice maker and let the unit in operation for about 10 minutes.

9. Disconnect again unit from power.

10. Repeat again #5 to dump reservoir from chemical solution and later rinse all parts by fresh water.

11. Prepare as per #6 using SCOTSMAN sanitizer rather then cleaner. Possible sanitizing solution could be by mixing 3 cl (10 oz) of sanitizer with 10 lt (2 gallons) of warm potable water.

NEVER MIX CLEANING WITH SANITIZING SOLUTION

12. Pour sanitizing solution in the water reservoir.

13. Plug IN again the unit and let the sanitizing solution re-circulating for about 5 minutes.

14. Repeat as per #5 to dump sanitizing solution stored in the same then relocate the same.

15.

Open water inlet valve previously closed at #4.

16. Ice produced during the first 5 minutes must be thrown away in order to avoid any possible chemical contamination.

CAUTION - NEVER use ice produced from any chemical solution. Be sure none falls into storage bin.

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SECTION VI

SERVICE DIAGNOSIS

The Service Diagnosis Section is for use in aiding the servicemen in diagnosing a particular problem for pin-pointing the area in which the problems lines, thus an ever available reference for proper corrective action.

The following chart lists corrective actions for the causes of known symptoms of certain problems that can occur in the ice makingrefrigerarion system.

SYMPTON POSSYBLE CAUSE CORRECTION

Red Light glows- Intermittent water supply Water shut-off valve closed. Lo-water pressure. or too low water pressure. Check and clean water strainer.

The unit does not make ice. Fiber key in gear reducer Remove Gear box

bore broken. and change fiber key. V-belt loose or broken. Check. Repair or replace.

The compressor runs but no Gear in gear box stripped. Check and replace. ice is made.

Pulley loose on motor shaft. Repair. Water not entering reservoir. Check and clean. Water float

valve to be cleaned.

Red Light glows- Hi-pressure control cut-off Check cooling water at Hi-pressure excessive. unit operation. condenser. Condenser tube

clogged-up. Water regulating valve to be re-adjusted.

Fan motor out of operations.

reen Light is Blown fuse. Replace fuse and check for

off. Unit will not run. cause of blow fuse.

Loose electrical connection. Check wiring. Switch in OFF position. Turn switch to ON. Inoperative master switch. Replace switch. Spout switch cut-out. Check ice chute arrangement. Contactor coil-open winding. Replace contactor.

1. ICE MAKING - REFRIGERATION SYSTEM

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SYMPTON POSSYBLE CAUSE CORRECTION

Excessive noise. Misaligned V-belt. Aligne V-belt.

Gear reducer loose on frame. Tighten. Drive motor end-play or worm Repair or replace.

bearings. Motor compressor not Loosen hold-down bolts.

floating on rubber cushions. Water level in evaporator Set water level as shown

drum basin too low. on page 27.

Excessive vibration. Ice formation underneath Remove blade amd melt-up

blade-frictioning against ice formation. rotating drum. Adjust water level as shown

on page 27.

Compressor cycles Water regulating valve too close. Open water valve.

AEV valve closed. Adjust. Non-condensable gases in sustem.

Purge-off.

Making wet ice Surrounging air temperature Correct or move unit to cooled

above 40°C (100°F) location. Under-or-over-charge of refrigerant.

Re-charge with proper amount.

Closed AEV. Adjust valve for correct refrigerant

flow.

Faulty compressor valve plate. Repair or replace.

Low ice production. Loss of refrigerant, under Check and recharge with

or overcharge of refrigerant. proper amount of refrigerant. Plugged condenser water tubes. Clean condensor. Low water level in the reservoir. Check float valve operation. Overcharge of oil in system. Check at oil sight glass.

Lower to 1/2 sight glass.

Light glows- Evaporator - drum speed very Gear Reducer shaft's fiber key Evaporator - drum doesn't turn low - 1/4 rotation in more then 40" breakage. (ice maker OFF).

V belt slipping Effect hall sensor failure. Effect hall magnetic pins

demagnetized.

Light glows- Wrong power voltage cable Interchange phases plug IN. Wrong 3 phases monitoring wiring. relay cut out.

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